Well, there are clearly some listwashers who are trying very hard not
to know it. That's why it'd be nice if there were something we could
Mayhaps you're referring to the "Email Validation: Pros and Cons" session at
the San Francisco MAAWG?
Sort of, if the advice there were written down in a public place.
(Yes, I believe some of the panel were honestly looking for mechanisms to
identify bad actors, not mechanisms for cleaning lists.)
Sometimes you just can't have everything you want.
John Levine, johnl(_at_)iecc(_dot_)com, Primary Perpetrator of "The Internet for
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